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A typical coal-fired power plant burns 310 metric tons of coalevery hour to generate 780MW of electricity. 1metricton=1000kg. The density of coal is 1500 kg/m3 and its heat of combustion is 28 MJ/kg. Assume that all heat is transferred from the fuel to the boiler and thatall the work done in spinning the turbine is transformed into electrical energy.
What is the power plant's thermal efficiency?
A loud speaker is playing rock music. Consider the sound from it as a spherical wave. what is the sound intensity level
A 15-g ball is shot from a spring gun whose spring has a force constant of 600N/m. The spring can be compressed 5 cm. How high can the ball be shot if the gun is aimed vertically
Three resistors, 2.57ohm, 2.51ohm, and 4.45ohm, are connected in series across a 24.4-V battery
A proton accelerates from rest in a uniform electric field of 690 N/C. At one later moment, its speed is 1.30 Mm/s, What is its kinetic energy at the end of this interval
Two capacitors, C1 = 2.0mF and C2 = 7.0mF , are in series, Find the charge stored on the second capacitor
A particle with a charge of q = -5.00 nC is moving in the uniform magnetic field of vec{B}=( -1.20 T ) hat{z}. The magnetic force on the particle is measured to be vec{F}= ( -7.60×10-7 N )hat{y}.
Timberland’s incremental tax rate is 30%. Prepare a budgeted income statement assuming that Timberland sells 2,500 tons. Illustrate what is the contribution margin per ton?
An ambulance passes a bus stop at 50m/s with a siren of 340Hz, What is the wavelength heard by the bus stop costumers as the ambulance approaches
An electron is placed in a uniform electric field of strength 210 N/C. If the electron is at rest at the origin of a coordinate system at t = 0 and the electric field is in the positive x-direction
An 7.80 ball, hanging from the ceiling by a light wire 105 long, is struck in an elastic collision by a 2.20 ball moving horizontally at 5.00 just before the collision. Find out the tension in the wire just after the collision.
A car travels due east with a speed of 44.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. Find the velocity of the rain
A 0.144 kg baseball is pitched horizontally at +38 m/s and after it is hit by the bat it moves horizontally at -38 m/s.
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